Anti-MCTS1 re-initiation and release factor antibodies are used for the immunodetection of the protein encoded by the MCTS1 gene. In humans, the canonical protein has a reported length of 181 amino acid residues and a mass of 20.6 kDa. Its subcellular localization is in the cytoplasm. Alternative splicing is reported to yield 3 different isoforms for this protein. It is ubiquitously expressed across many tissue types. A member of the MCTS1 protein family, it is a reported anti-oncogene that plays a role in cell cycle regulation; decreases cell doubling time and anchorage-dependent growth; shortens the duration of G1 transit time and G1/S transition. Post-translational modifications have been described, including phosphorylation. Other names for this target antigen include MCT1, malignant T-cell-amplified sequence 1, malignant T-cell amplified sequence 1, multiple copies T-cell malignancies, multiple copies in T-cell lymphoma-1, and MCT-1. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.